JPH0972634A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an oil separating performance or increase an oil recovering amount in an oil separator installed between a compressor and a condenser constituting a freezing cycle by a method wherein refrigerant gas is passed through a plurality of cubic filters formed by oil separator raw material. SOLUTION: Refrigerant gas of high temperature and high pressure compressed by a compressor flows from an inlet coupling 13 into a first cubic filter 20, disperses in a radial direction and passes out of the first cubic filter 20. In this case, the refrigerant gas advances while flowing in a gap to be abutted against aluminum cut pieces, oil is separated and dripped during this striking and friction step. In addition, the refrigerant gas passes through a second cubic filter 25 from a lower part to an upper part and similarly residual oil is separated from it and dripped, thereafter the refrigerant gas is circulated in a freezing cycle from an outlet coupling 14 to a condenser. In addition, the separated oil is further sucked into a capillary tube 30 with a suction force of the compressor, thereafter the oil is transported from the oil returning coupling 15 to the compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided on a discharge side of a compressor in a refrigerating cycle of a refrigerant such as a refrigerating machine or an air conditioner, and separates a lubricating oil of the compressor contained in a discharge gas from the compressor. The present invention relates to an oil separator that has a function of returning to.

[0002]

2. Description of the Related Art A refrigeration cycle is formed by a refrigerant circulation cycle from a compressor to a condenser to an evaporator to a compressor, and an oil separator is provided between the compressor and the condenser. This is because by returning the lubricating oil that has flowed into the discharge gas of the rotary compressor and reciprocating compressor to the compressor, the lubricating oil to the compressor cylinder becomes insufficiently supplied, and the risk of seizure is avoided and circulation This prevents the refrigerating capacity from being deteriorated due to the mixing of oil in the refrigerant. Then, the oil separator is formed in a closed container shape, and a discharge gas is ejected from the nozzle connected to the discharge side of the compressor along the inner peripheral surface of the side wall to be swirled to drop oil having a large inertial force. It is generally constructed so that it is stored in the inner bottom portion, sucked by a capillary tube wound in a coil in a container, and conveyed to a compressor. Further, a net-like strainer is stretched inside the container to remove foreign matters in the discharged gas.

[0003]

However, in the oil separator having such a configuration, it is difficult to obtain sufficient oil separation performance and oil recovery amount because the separation of oil depends on the centrifugal differential pressure action. In addition, there is a problem that the capillary tube is clogged by foreign matter mixed in the oil during long-term use, and the separated oil cannot be conveyed.

An object of the present invention is to provide an oil separator having a new structure to solve these problems. It improves the separation performance of oil contained in the discharge gas of a compressor and increases the oil recovery amount. Furthermore, the present invention provides an oil separator that can completely remove foreign matter mixed in the discharge gas.

[0005]

To achieve the above object, the oil separator of the present invention is provided with a refrigerant gas inlet connected to the discharge side of the compressor and a refrigerant gas outlet connected to the suction side of the condenser. To form a closed container, and form a first three-dimensional filter and a second three-dimensional filter formed of an oil separating material. Then, the first three-dimensional filter formed in a tubular shape is connected to the inlet and installed in the vessel, the second three-dimensional filter is installed in the vessel with a space from the first three-dimensional filter, and the inside of the first three-dimensional filter is introduced from the inlet. It is characterized in that the refrigerant gas that has flowed into the device passes through the compatible filter and circulates from the outlet.

Further, the second three-dimensional filter is formed in a cylindrical shape like the first three-dimensional filter, and the second three-dimensional filter is connected to the outlet. Specific embodiments of the present invention will be described below with reference to the drawings.

[0007]

1 is a first embodiment of an oil separator of the present invention, which is a cylindrical body (1
0), the upper cover (11) and the lower cover (12) are hermetically joined together to form a closed container. The body (10) has an inlet joint (13), and the upper cover (11) has an outlet joint (1).
4) is joined to form an inlet and an outlet for the refrigerant gas, and an oil return joint (15) is joined to the lower cover (12).

A first solid filter (20) is a hollow cylindrical member having a predetermined wall thickness, which is an oil separation material formed by molding aluminum pieces into a lump, and is connected to the inner end of the inlet joint (13). . The first three-dimensional filter (20) is assembled by covering the outer skin with a perforated plate (22) such as a wire mesh or a punching metal plate and closing the bottom surface with an end plate (23) to connect the open end to the inlet joint (13). And communicate with each other, and are installed in the middle level of the vessel. Then, a second three-dimensional filter (25) made of the same material is installed above the first three-dimensional filter (20) in a position in the upper layer of the vessel, and the second three-dimensional filter (25) has a peripheral edge on the main body (10). It is installed in a state of filling a space partitioned by a pair of upper and lower perforated plates (26) and (27) fixed to each other.

At the inner bottom, a cylindrical tube (3) having a capillary tube (30) wound in a coil shape on the outer peripheral surface thereof.
1) is stored by abutting the lower end of the lower cover (12),
A plurality of notches (32) are formed from the lower end of the tubular body (31) to communicate the inside and outside. Capillary tube (30)
Has one end opened at the lower end of the tubular body (31),
Is bent inward in a U-shape from the upper end of the oil return joint, and is supported by joining a guide pipe (33) standing on the oil return joint (15) to the outer peripheral surface and the other end to the oil return joint (15). Connected.

This oil separator has an inlet joint (1
3) is connected to the discharge side of the compressor, the outlet joint (14) is connected to the suction side of the condenser, and the oil return joint (15) is connected to the oil return pipe to the compressor. Intervening in. The high-temperature and high-pressure refrigerant gas compressed by the compressor flows into the first three-dimensional filter (20) from the inlet joint (13), diffuses in the radial direction, and then the first three-dimensional filter (2
Pass 0) from inside to outside. Here, the refrigerant gas advances through the gap while colliding with the aluminum piece, and the oil that has flowed out into the discharge gas during the collision and friction process is separated and dropped. Further, the refrigerant gas passes through the second three-dimensional filter (25) from bottom to top, and the residual oil is separated and dropped in the stroke of collision and friction, and the refrigeration cycle is circulated from the outlet joint (14) to the condenser. To do. The oil separated by the first three-dimensional filter (20) and the second three-dimensional filter (25) is stored in the bottom part and is sucked into the capillary tube (30) by the suction force generated by the differential pressure between the discharge and suction of the compressor,
The oil is returned from the oil return joint (15) to the compressor. Further, the foreign matter mixed in the refrigerant gas is removed in the passage process of the compatible filters (20) and (25), and the clean refrigerant gas is circulated and the clean oil is conveyed.

2 and 3 show another embodiment of the oil separator of the present invention, in which an upper cover (11) and a lower cover (12) are joined to a cylindrical body (10) in a hermetically sealed manner. An inlet pipe (16) and an outlet pipe (17) are provided through the upper cover (11) to form an inlet and an outlet for the refrigerant gas. The first three-dimensional filter (20a) and the second three-dimensional filter (25
a) is formed into a hollow cylinder having a predetermined wall thickness, the outer skin is covered with a perforated plate (28), and the bottom surface is closed with an end plate (29) to be assembled in the same shape. And the inlet pipe (16)
The open end of the first three-dimensional filter (20a) is connected to and communicates with the lower end of the outlet pipe (17) and the open end of the second three-dimensional filter (25a) is connected to and communicates with the compatible filter (20a). ) And (25a) are installed side by side in a hanging state.

A float switch (35) for detecting the liquid level by a float that moves up and down in the axial direction in association with the oil level is housed in the bottom of the vessel, and is turned on at a predetermined liquid level and is provided in an oil return pipe. It is configured to open the solenoid valve. Then, the lower end is opened to the bottom of the vessel and the suction pipe (3
7) extends vertically, and the suction pipe (37) is connected to an oil return joint (15) joined to the upper cover (11).

This oil separator has an inlet pipe (16).
Is connected to the discharge side of the compressor, the outlet pipe (17) is connected to the suction side of the condenser, and the oil return joint (15) is connected to the oil return pipe of the compressor. To do.
The high-temperature and high-pressure refrigerant gas discharged from the compressor is supplied to the inlet pipe (1
6) flows into the first three-dimensional filter (20a), diffuses, passes through the first three-dimensional filter (20a) from the inside to the outside, and oil is separated and dropped in the same process as in the previous example. Further, it passes through the second three-dimensional filter (25a) from the outside to the inside, and the residual oil is separated and dropped there, and then flows into the second three-dimensional filter (25a) and flows from the outlet pipe (17) to the condenser. Circulate to the inhalation side. Both three-dimensional filters (20a),
The oil separated in (25a) is stored in the bottom, the float rises and the float switch (35) is turned on at a predetermined liquid level, and the electromagnetic coil of the electromagnetic valve provided in the oil return pipe is excited and opened. The oil return pipe is opened, and the oil is sucked up by the suction pipe (37) and conveyed to the compressor.
And, like the previous example, the foreign matter mixed in the refrigerant gas is
The three-dimensional filters (20a) and (25a) are removed in the passing process, the clean refrigerant gas is circulated, and the clean oil is conveyed.

In the present invention, the first three-dimensional filter (20) and the second three-dimensional filter (25) use other corrosion-resistant and oil-resistant slices or ceramics, or their granular or lumpy bodies as oil separating members. It can also be molded. Further, the first three-dimensional filter (20) and the second three-dimensional filter (25) may be made of different materials.

[0015]

As described above, according to the oil separator of the present invention, the gas discharged from the compressor flows into the first three-dimensional filter (20) through the inlet, and the first three-dimensional filter (20) passes through the passage. To separate the oil, and further to separate the residual oil in the passing process of the second three-dimensional filter (25),
The oil that has flowed out into the discharge gas is separated in a double stroke. The separation of oil does not depend on the centrifugal separation pressure difference action as in the conventional case, and the three-dimensional filters (20) and (25) have a predetermined thickness and volume, and the refrigerant gas repeatedly collides with and frictions. To separate the oil with high precision,
Excellent oil separation performance and sufficient oil recovery can be obtained. Then, the foreign matter mixed in the refrigerant gas is completely removed in the passage process of the compatible filters (20) and (25), and the clean refrigerant gas can be circulated and the clean oil can be conveyed. .

The three-dimensional filters (20), (25)
It is manufactured by assembling, is formed into a tubular shape, is connected to the inlet and the outlet, and can be installed in the container very easily, and has an effective function such as excellent assembly workability.

[Brief description of drawings]

FIG. 1 is a front sectional view of a first embodiment of the present invention.

FIG. 2 is a front sectional view of another embodiment of the present invention.

FIG. 3 is a side sectional view of the same.

[Explanation of reference numerals] 20 first three-dimensional filter 25 second three-dimensional filter 25a second three-dimensional filter

Claims (2)

[Claims] 1. An oil separator provided between a compressor and a condenser of a refrigeration cycle, wherein a refrigerant gas inlet connected to a compressor discharge side and a refrigerant gas outlet connected to a condenser suction side are provided. The first solid filter (20) and the second solid filter (25), which are provided and formed in a closed container shape and formed of an oil separating material, are formed, and the first solid filter (20) formed in a cylindrical shape is provided at the inlet. Installed in the container by connecting, install the second three-dimensional filter (25) in the container with a space from the first three-dimensional filter (20),
An oil separator, characterized in that the refrigerant gas flowing into the first three-dimensional filter (20) from the inlet passes through the compatible filters (20) and (25) and circulates from the outlet. 2. The oil separator according to claim 1, wherein the second three-dimensional filter (25a) is formed in a tubular shape and connected to the outlet.